You have an infection. See your doctor because it is likely to get worse.
When you have your navel pierced it is normal for it to itch while it is healing. That is just telling you that it is still healing. Don't itch it though. Ignore it, eventually it will pass.
When you get pregnant, most care providers recommend removing your belly button ring. Even women who don't remove their rings report that belly button rings itch and pull as the belly stretches around the fifth or sixth month. There is also the risk of infection if the belly button ring scratches you or opens a small wound. If you do take out your belly button ring, the piercing hole will probably close, requiring you to re-pierce your belly button after having your baby. However, if you don't want to take out your belly button ring you may want to purchase a non-metal pregnancy piercing ring. These are flexible and two inches long to accommodate your growing belly. Pregnant women claim that this product allows them to keep their bellies pierced without the discomfort of other belly button piercing.
Chiggers.
I would say at most 3 weeks but everyone heals differently. If you're really worried about it, go see your piercer and have them check it out.
No, its not infected. Just clean it to get rid of the "crustys" and then it will most likely stop itching.
your cat may be scooting to itch like dogs do.
only if you want it to be sore and itcy
could be ring worm (which is not really a worm it is a fungus) it doesn't always itch.
If he is still a baby, could mean that the umbilical cord is infected and if he is older, it is still not normal and you need to have him checked. If that goes on for a longer period it could affect his appetite and give him a intestinal discomfort as well.
you have a yeast infection, call your doctor and take reccomendations on how to slow down the infection
The skin on the belly hands or feet may itch during pregnancy because of the skin stretching.
Well that's weird if they don't itch or anything. I would think they would be chiggers. sorry